/* 
 * $Id: SwingWorker.java,v 1.6 2008/07/25 19:32:29 idk Exp $
 * 
 * Copyright @ 2005 Sun Microsystems, Inc. All rights
 * reserved. Use is subject to license terms.
 */

package com.github.xsavikx.androidscreencast.ui.worker;

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.util.List;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;

/**
 * An abstract class to perform lengthy GUI-interacting tasks in a dedicated thread.
 * <p>
 * <p>
 * When writing a multi-threaded application using Swing, there are two constraints to keep in mind: (refer to
 * <a href="http://java.sun.com/docs/books/tutorial/uiswing/misc/threads.html"> How to Use Threads </a> for more details):
 * <ul>
 * <li>Time-consuming tasks should not be run on the <i>Event Dispatch Thread</i>. Otherwise the application becomes unresponsive.</li>
 * <li>Swing components should be accessed on the <i>Event Dispatch Thread</i> only.</li>
 * </ul>
 * <p>
 * <p>
 * <p>
 * <p>
 * These constraints mean that a GUI application with time intensive computing needs at least two threads: 1) a thread to perform the lengthy task and
 * 2) the <i>Event Dispatch Thread</i> (EDT) for all GUI-related activities. This involves inter-thread communication which can be tricky to
 * implement.
 * <p>
 * <p>
 * {@code SwingWorker} is designed for situations where you need to have a long running task run in a background thread and provide updates to the UI
 * either when done, or while processing. Subclasses of {@code SwingWorker} must implement the {@see #doInBackground} method to perform the background
 * computation.
 * <p>
 * <p>
 * <p>
 * <b>Workflow</b>
 * <p>
 * There are three threads involved in the life cycle of a {@code SwingWorker} :
 * <ul>
 * <li>
 * <p>
 * <i>Current</i> thread: The {@link #execute} method is called on this thread. It schedules {@code SwingWorker} for the execution on a <i>worker</i>
 * thread and returns immediately. One can wait for the {@code SwingWorker} to complete using the {@link #get get} methods.
 * <li>
 * <p>
 * <i>Worker</i> thread: The {@link #doInBackground} method is called on this thread. This is where all background activities should happen. To notify
 * {@code PropertyChangeListeners} about bound properties changes use the {@link #firePropertyChange firePropertyChange} and
 * {@link #getPropertyChangeSupport} methods. By default there are two bound properties available: {@code state} and {@code progress}.
 * <li>
 * <p>
 * <i>Event Dispatch Thread</i>: All Swing related activities occur on this thread. {@code SwingWorker} invokes the {@link #process process} and
 * {@link #done} methods and notifies any {@code PropertyChangeListeners} on this thread.
 * </ul>
 * <p>
 * <p>
 * Often, the <i>Current</i> thread is the <i>Event Dispatch Thread</i>.
 * <p>
 * <p>
 * <p>
 * Before the {@code doInBackground} method is invoked on a <i>worker</i> thread, {@code SwingWorker} notifies any {@code PropertyChangeListeners}
 * about the {@code state} property change to {@code StateValue.STARTED}. After the {@code doInBackground} method is finished the {@code done} method
 * is executed. Then {@code SwingWorker} notifies any {@code PropertyChangeListeners} about the {@code state} property change to
 * {@code StateValue.DONE}.
 * <p>
 * <p>
 * {@code SwingWorker} is only designed to be executed once. Executing a {@code SwingWorker} more than once will not result in invoking the
 * {@code doInBackground} method twice.
 * <p>
 * <p>
 * <b>Sample Usage</b>
 * <p>
 * The following example illustrates the simplest use case. Some processing is done in the background and when done you update a Swing component.
 * <p>
 * <p>
 * Say we want to find the "Meaning of Life" and display the result in a {@code JLabel}.
 * <p>
 * <pre>
 *   final JLabel label;
 *   class MeaningOfLifeFinder extends SwingWorker&lt;String, Object&gt; {
 *       {@code @Override}
 *       public String doInBackground() {
 *           return findTheMeaningOfLife();
 *       }
 *
 *       {@code @Override}
 *       protected void done() {
 *           try {
 *               label.setText(get());
 *           } catch (Exception ignore) {
 *           }
 *       }
 *   }
 *
 *   (new MeaningOfLifeFinder()).execute();
 * </pre>
 * <p>
 * <p>
 * The next example is useful in situations where you wish to process data as it is ready on the <i>Event Dispatch Thread</i>.
 * <p>
 * <p>
 * Now we want to find the first N prime numbers and display the results in a {@code JTextArea}. While this is computing, we want to update our
 * progress in a {@code JProgressBar}. Finally, we also want to print the prime numbers to {@code System.out}.
 * <p>
 * <pre>
 * class PrimeNumbersTask extends
 *         SwingWorker&lt;List&lt;Integer&gt;, Integer&gt; {
 *     PrimeNumbersTask(JTextArea textArea, int numbersToFind) {
 *         //initialize
 *     }
 *
 *     {@code @Override}
 *     public List&lt;Integer&gt; doInBackground() {
 *         while (! enough &amp;&amp; ! isCancelled()) {
 *                 number = nextPrimeNumber();
 *                 publish(number);
 *                 setProgress(100 * numbers.size() / numbersToFind);
 *             }
 *         }
 *         return numbers;
 *     }
 *
 *     {@code @Override}
 *     protected void process(List&lt;Integer&gt; chunks) {
 *         for (int number : chunks) {
 *             textArea.append(number + &quot;\n&quot;);
 *         }
 *     }
 * }
 *
 * JTextArea textArea = new JTextArea();
 * final JProgressBar progressBar = new JProgressBar(0, 100);
 * PrimeNumbersTask task = new PrimeNumbersTask(textArea, N);
 * task.addPropertyChangeListener(
 *     new PropertyChangeListener() {
 *         public  void propertyChange(PropertyChangeEvent evt) {
 *             if (&quot;progress&quot;.equals(evt.getPropertyName())) {
 *                 progressBar.setValue((Integer)evt.getNewValue());
 *             }
 *         }
 *     });
 *
 * task.execute();
 * System.out.println(task.get()); //prints all prime numbers we have got
 * </pre>
 * <p>
 * <p>
 * Because {@code SwingWorker} implements {@code Runnable}, a {@code SwingWorker} can be submitted to an {@link java.util.concurrent.Executor} for
 * execution.
 *
 * @param <T> the result type returned by this {@code SwingWorker's} {@code doInBackground} and {@code get} methods
 * @param <V> the type used for carrying out intermediate results by this {@code SwingWorker's} {@code publish} and {@code process} methods
 * @author Igor Kushnirskiy
 * @version $Revision: 1.6 $ $Date: 2008/07/25 19:32:29 $
 */
public abstract class SwingWorker<T, V> implements Future<T>, Runnable {
    /**
     * number of worker threads.
     */
    private static final int MAX_WORKER_THREADS = 10;
    private static final AccumulativeRunnable<Runnable> doSubmit = new DoSubmitAccumulativeRunnable();
    private static ExecutorService executorService = null;
    /**
     * everything is run inside this FutureTask. Also it is used as a delegatee for the Future API.
     */
    private final FutureTask<T> future;
    /**
     * all propertyChangeSupport goes through this.
     */
    private final PropertyChangeSupport propertyChangeSupport;
    /**
     * current progress.
     */
    private volatile int progress;

    /**
     * current state.
     */
    private volatile StateValue state;
    /**
     * handler for {@code process} method.
     */
    private AccumulativeRunnable<V> doProcess;
    /**
     * handler for progress property change notifications.
     */
    private AccumulativeRunnable<Integer> doNotifyProgressChange;

    /**
     * Constructs this {@code SwingWorker}.
     */
    public SwingWorker() {
        Callable<T> callable = new Callable<T>() {
            @Override
            public T call() throws Exception {
                setState(StateValue.STARTED);
                return doInBackground();
            }
        };

        future = new FutureTask<T>(callable) {
            @Override
            protected void done() {
                doneEDT();
                setState(StateValue.DONE);
            }
        };

        state = StateValue.PENDING;
        propertyChangeSupport = new SwingWorkerPropertyChangeSupport(this);
        doProcess = null;
        doNotifyProgressChange = null;
    }

    /**
     * returns workersExecutorService.
     * <p>
     * returns the service stored in the appContext or creates it if necessary. If the last one it triggers autoShutdown thread to get started.
     *
     * @return ExecutorService for the {@code SwingWorkers}
     */
    private static synchronized ExecutorService getWorkersExecutorService() {
        if (executorService == null) {
            // this creates non-daemon threads.
            ThreadFactory threadFactory = new ThreadFactory() {
                final AtomicInteger threadNumber = new AtomicInteger(1);

                @Override
                public Thread newThread(final Runnable r) {
                    StringBuilder name = new StringBuilder("SwingWorker-pool-");
                    name.append(System.identityHashCode(this));
                    name.append("-thread-");
                    name.append(threadNumber.getAndIncrement());

                    Thread t = new Thread(r, name.toString());
                    if (t.isDaemon())
                        t.setDaemon(false);
                    if (t.getPriority() != Thread.NORM_PRIORITY)
                        t.setPriority(Thread.NORM_PRIORITY);
                    return t;
                }
            };

      /*
       * We want a to have no more than MAX_WORKER_THREADS running threads.
       *
       * We want a worker thread to wait no longer than 1 second for new tasks before terminating.
       */
            executorService = new ThreadPoolExecutor(0, MAX_WORKER_THREADS, 5L, TimeUnit.SECONDS,
                    new LinkedBlockingQueue<Runnable>(), threadFactory) {

                private final ReentrantLock pauseLock = new ReentrantLock();
                private final Condition unpaused = pauseLock.newCondition();
                private final ReentrantLock executeLock = new ReentrantLock();
                private boolean isPaused = false;

                @Override
                protected void afterExecute(Runnable r, Throwable t) {
                    super.afterExecute(r, t);
                    pauseLock.lock();
                    try {
                        while (isPaused) {
                            unpaused.await();
                        }
                    } catch (InterruptedException ignore) {

                    } finally {
                        pauseLock.unlock();
                    }
                }

                @Override
                public void execute(Runnable command) {
          /*
           * ThreadPoolExecutor first tries to run task in a corePool. If all threads are busy it tries to add task to the waiting queue. If it fails
           * it run task in maximumPool.
           *
           * We want corePool to be 0 and maximumPool to be MAX_WORKER_THREADS We need to change the order of the execution. First try corePool then
           * try maximumPool pool and only then store to the waiting queue. We can not do that because we would need access to the private methods.
           *
           * Instead we enlarge corePool to MAX_WORKER_THREADS before the execution and shrink it back to 0 after. It does pretty much what we need.
           *
           * While we changing the corePoolSize we need to stop running worker threads from accepting new tasks.
           */

                    // we need atomicity for the execute method.
                    executeLock.lock();
                    try {

                        pauseLock.lock();
                        try {
                            isPaused = true;
                        } finally {
                            pauseLock.unlock();
                        }

                        setCorePoolSize(MAX_WORKER_THREADS);
                        super.execute(command);
                        setCorePoolSize(0);

                        pauseLock.lock();
                        try {
                            isPaused = false;
                            unpaused.signalAll();
                        } finally {
                            pauseLock.unlock();
                        }
                    } finally {
                        executeLock.unlock();
                    }
                }
            };
        }
        return executorService;
    }

    /**
     * Adds a {@code PropertyChangeListener} to the listener list. The listener is registered for all properties. The same listener object may be added
     * more than once, and will be called as many times as it is added. If {@code listener} is {@code null}, no exception is thrown and no action is
     * taken.
     * <p>
     * <p>
     * Note: This is merely a convenience wrapper. All work is delegated to {@code PropertyChangeSupport} from {@link #getPropertyChangeSupport}.
     *
     * @param listener the {@code PropertyChangeListener} to be added
     */
    public final void addPropertyChangeListener(PropertyChangeListener listener) {
        getPropertyChangeSupport().addPropertyChangeListener(listener);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public final boolean cancel(boolean mayInterruptIfRunning) {
        return future.cancel(mayInterruptIfRunning);
    }

    /**
     * Computes a result, or throws an exception if unable to do so.
     * <p>
     * <p>
     * Note that this method is executed only once.
     * <p>
     * <p>
     * Note: this method is executed in a background thread.
     *
     * @return the computed result
     * @throws Exception if unable to compute a result
     */
    protected abstract T doInBackground() throws Exception;

    // PropertyChangeSupports methods START

    /**
     * Executed on the <i>Event Dispatch Thread</i> after the {@code doInBackground} method is finished. The default implementation does nothing.
     * Subclasses may override this method to perform completion actions on the <i>Event Dispatch Thread</i>. Note that you can query status inside the
     * implementation of this method to determine the result of this task or whether this task has been cancelled.
     *
     * @see #doInBackground
     * @see #isCancelled()
     * @see #get
     */
    protected void done() {
        //
    }

    // Future methods START

    /**
     * Invokes {@code done} on the EDT.
     */
    private void doneEDT() {
        Runnable doDone = new Runnable() {
            @Override
            public void run() {
                done();
            }
        };
        if (SwingUtilities.isEventDispatchThread()) {
            doDone.run();
        } else {
            doSubmit.add(doDone);
        }
    }

    /**
     * Schedules this {@code SwingWorker} for execution on a <i>worker</i> thread. There are a number of <i>worker</i> threads available. In the event
     * all <i>worker</i> threads are busy handling other {@code SwingWorkers} this {@code SwingWorker} is placed in a waiting queue.
     * <p>
     * <p>
     * Note: {@code SwingWorker} is only designed to be executed once. Executing a {@code SwingWorker} more than once will not result in invoking the
     * {@code doInBackground} method twice.
     */
    public final void execute() {
        getWorkersExecutorService().execute(this);
    }

    /**
     * Reports a bound property update to any registered listeners. No event is fired if {@code old} and {@code new} are equal and non-null.
     * <p>
     * <p>
     * This {@code SwingWorker} will be the source for any generated events.
     * <p>
     * <p>
     * When called off the <i>Event Dispatch Thread</i> {@code PropertyChangeListeners} are notified asynchronously on the <i>Event Dispatch Thread</i>.
     * <p>
     * Note: This is merely a convenience wrapper. All work is delegated to {@code PropertyChangeSupport} from {@link #getPropertyChangeSupport}.
     *
     * @param propertyName the programmatic name of the property that was changed
     * @param oldValue     the old value of the property
     * @param newValue     the new value of the property
     */
    public final void firePropertyChange(String propertyName, Object oldValue, Object newValue) {
        getPropertyChangeSupport().firePropertyChange(propertyName, oldValue, newValue);
    }

    /**
     * {@inheritDoc}
     * <p>
     * Note: calling {@code get} on the <i>Event Dispatch Thread</i> blocks <i>all</i> events, including repaints, from being processed until this
     * {@code SwingWorker} is complete.
     * <p>
     * <p>
     * When you want the {@code SwingWorker} to block on the <i>Event Dispatch Thread</i> we recommend that you use a <i>modal dialog</i>.
     * <p>
     * <p>
     * For example:
     * <p>
     * <pre>
     * class SwingWorkerCompletionWaiter implements PropertyChangeListener {
     *   private JDialog dialog;
     *
     *   public SwingWorkerCompletionWaiter(JDialog dialog) {
     *     this.dialog = dialog;
     *   }
     *
     *   public void propertyChange(PropertyChangeEvent event) {
     *     if (&quot;state&quot;.equals(event.getPropertyName()) &amp;&amp; SwingWorker.StateValue.DONE == event.getNewValue()) {
     *       dialog.setVisible(false);
     *       dialog.dispose();
     *     }
     *   }
     * }
     * JDialog dialog = new JDialog(owner, true);
     * swingWorker.addPropertyChangeListener(new SwingWorkerCompletionWaiter(dialog));
     * swingWorker.execute();
     * // the dialog will be visible until the SwingWorker is done
     * dialog.setVisible(true);
     * </pre>
     */
    @Override
    public final T get() throws InterruptedException, ExecutionException {
        return future.get();
    }

    /**
     * {@inheritDoc}
     * <p>
     * Please refer to {@link #get} for more details.
     */
    @Override
    public final T get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
        return future.get(timeout, unit);
    }

    /**
     * Returns the {@code progress} bound property.
     *
     * @return the progress bound property.
     */
    public final int getProgress() {
        return progress;
    }

    /**
     * Sets the {@code progress} bound property. The value should be from 0 to 100.
     * <p>
     * <p>
     * Because {@code PropertyChangeListener}s are notified asynchronously on the <i>Event Dispatch Thread</i> multiple invocations to the
     * {@code setProgress} method might occur before any {@code PropertyChangeListeners} are invoked. For performance purposes all these invocations are
     * coalesced into one invocation with the last invocation argument only.
     * <p>
     * <p>
     * For example, the following invocations:
     * <p>
     * <pre>
     * setProgress(1);
     * setProgress(2);
     * setProgress(3);
     * </pre>
     * <p>
     * might result in a single {@code PropertyChangeListener} notification with the value {@code 3}.
     *
     * @param progress the progress value to set
     * @throws IllegalArgumentException is value not from 0 to 100
     */
    protected final void setProgress(int progress) {
        if (progress < 0 || progress > 100) {
            throw new IllegalArgumentException("the value should be from 0 to 100");
        }
        if (this.progress == progress) {
            return;
        }
        int oldProgress = this.progress;
        this.progress = progress;
        if (!getPropertyChangeSupport().hasListeners("progress")) {
            return;
        }
        synchronized (this) {
            if (doNotifyProgressChange == null) {
                doNotifyProgressChange = new AccumulativeRunnable<Integer>() {
                    @Override
                    public void run(List<Integer> args) {
                        firePropertyChange("progress", args.get(0), args.get(args.size() - 1));
                    }

                    @Override
                    protected void submit() {
                        doSubmit.add(this);
                    }
                };
            }
        }
        doNotifyProgressChange.add(oldProgress, progress);
    }

    /**
     * Returns the {@code PropertyChangeSupport} for this {@code SwingWorker}. This method is used when flexible access to bound properties support is
     * needed.
     * <p>
     * This {@code SwingWorker} will be the source for any generated events.
     * <p>
     * <p>
     * Note: The returned {@code PropertyChangeSupport} notifies any {@code PropertyChangeListener}s asynchronously on the <i>Event Dispatch Thread</i>
     * in the event that {@code firePropertyChange} or {@code fireIndexedPropertyChange} are called off the <i>Event Dispatch Thread</i>.
     *
     * @return {@code PropertyChangeSupport} for this {@code SwingWorker}
     */
    public final PropertyChangeSupport getPropertyChangeSupport() {
        return propertyChangeSupport;
    }

    /**
     * Returns the {@code SwingWorker} state bound property.
     *
     * @return the current state
     */
    public final StateValue getState() {
    /*
     * DONE is a special case to keep getState and isDone is sync
     */
        if (isDone()) {
            return StateValue.DONE;
        } else {
            return state;
        }
    }

    // Future methods END

    /**
     * Sets this {@code SwingWorker} state bound property.
     *
     * @param the state state to set
     */
    private void setState(StateValue state) {
        StateValue old = this.state;
        this.state = state;
        firePropertyChange("state", old, state);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public final boolean isCancelled() {
        return future.isCancelled();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public final boolean isDone() {
        return future.isDone();
    }

    /**
     * Receives data chunks from the {@code publish} method asynchronously on the <i>Event Dispatch Thread</i>.
     * <p>
     * <p>
     * Please refer to the {@link #publish} method for more details.
     *
     * @param chunks intermediate results to process
     * @see #publish
     */
    protected void process(List<V> chunks) {
        //
    }

    // PropertyChangeSupports methods END

    /**
     * Sends data chunks to the {@link #process} method. This method is to be used from inside the {@code doInBackground} method to deliver intermediate
     * results for processing on the <i>Event Dispatch Thread</i> inside the {@code process} method.
     * <p>
     * <p>
     * Because the {@code process} method is invoked asynchronously on the <i>Event Dispatch Thread</i> multiple invocations to the {@code publish}
     * method might occur before the {@code process} method is executed. For performance purposes all these invocations are coalesced into one
     * invocation with concatenated arguments.
     * <p>
     * <p>
     * For example:
     * <p>
     * <pre>
     * publish(&quot;1&quot;);
     * publish(&quot;2&quot;, &quot;3&quot;);
     * publish(&quot;4&quot;, &quot;5&quot;, &quot;6&quot;);
     * </pre>
     * <p>
     * might result in:
     * <p>
     * <pre>
     * process(&quot;1&quot;, &quot;2&quot;, &quot;3&quot;, &quot;4&quot;, &quot;5&quot;, &quot;6&quot;)
     * </pre>
     * <p>
     * <p>
     * <b>Sample Usage</b>. This code snippet loads some tabular data and updates {@code DefaultTableModel} with it. Note that it safe to mutate the
     * tableModel from inside the {@code process} method because it is invoked on the <i>Event Dispatch Thread</i>.
     * <p>
     * <pre>
     * class TableSwingWorker extends
     *         SwingWorker&lt;DefaultTableModel, Object[]&gt; {
     *     private final DefaultTableModel tableModel;
     *
     *     public TableSwingWorker(DefaultTableModel tableModel) {
     *         this.tableModel = tableModel;
     *     }
     *
     *     {@code @Override}
     *     protected DefaultTableModel doInBackground() throws Exception {
     *         for (Object[] row = loadData();
     *                  ! isCancelled() &amp;&amp; row != null;
     *                  row = loadData()) {
     *             publish((Object[]) row);
     *         }
     *         return tableModel;
     *     }
     *
     *     {@code @Override}
     *     protected void process(List&lt;Object[]&gt; chunks) {
     *         for (Object[] row : chunks) {
     *             tableModel.addRow(row);
     *         }
     *     }
     * }
     * </pre>
     *
     * @param chunks intermediate results to process
     * @see #process
     */
    protected final void publish(V... chunks) {
        synchronized (this) {
            if (doProcess == null) {
                doProcess = new AccumulativeRunnable<V>() {
                    @Override
                    public void run(List<V> args) {
                        process(args);
                    }

                    @Override
                    protected void submit() {
                        doSubmit.add(this);
                    }
                };
            }
        }
        doProcess.add(chunks);
    }

    /**
     * Removes a {@code PropertyChangeListener} from the listener list. This removes a {@code PropertyChangeListener} that was registered for all
     * properties. If {@code listener} was added more than once to the same event source, it will be notified one less time after being removed. If
     * {@code listener} is {@code null}, or was never added, no exception is thrown and no action is taken.
     * <p>
     * <p>
     * Note: This is merely a convenience wrapper. All work is delegated to {@code PropertyChangeSupport} from {@link #getPropertyChangeSupport}.
     *
     * @param listener the {@code PropertyChangeListener} to be removed
     */
    public final void removePropertyChangeListener(PropertyChangeListener listener) {
        getPropertyChangeSupport().removePropertyChangeListener(listener);
    }

    /**
     * Sets this {@code Future} to the result of computation unless it has been cancelled.
     */
    @Override
    public final void run() {
        future.run();
    }

    /**
     * Values for the {@code state} bound property.
     */
    public enum StateValue {
        /**
         * Initial {@code SwingWorker} state.
         */
        PENDING, /**
         * {@code SwingWorker} is {@code STARTED} before invoking {@code doInBackground}.
         */
        STARTED,

        /**
         * {@code SwingWorker} is {@code DONE} after {@code doInBackground} method is finished.
         */
        DONE
    }

    private static class DoSubmitAccumulativeRunnable extends AccumulativeRunnable<Runnable> implements ActionListener {
        private final static int DELAY = 1000 / 30;

        @Override
        public void actionPerformed(ActionEvent event) {
            run();
        }

        @Override
        protected void run(List<Runnable> args) {
            int i = 0;
            try {
                for (Runnable runnable : args) {
                    i++;
                    runnable.run();
                }
            } finally {
                if (i < args.size()) {
          /*
           * there was an exception schedule all the unhandled items for the next time
           */
                    Runnable argsTail[] = new Runnable[args.size() - i];
                    for (int j = 0; j < argsTail.length; j++) {
                        argsTail[j] = args.get(i + j);
                    }
                    add(true, argsTail);
                }
            }
        }

        @Override
        protected void submit() {
            Timer timer = new Timer(DELAY, this);
            timer.setRepeats(false);
            timer.start();
        }
    }

    private class SwingWorkerPropertyChangeSupport extends PropertyChangeSupport {
        private static final long serialVersionUID = 2409754725172747617L;

        SwingWorkerPropertyChangeSupport(Object source) {
            super(source);
        }

        @Override
        public void firePropertyChange(final PropertyChangeEvent evt) {
            if (SwingUtilities.isEventDispatchThread()) {
                super.firePropertyChange(evt);
            } else {
                doSubmit.add(new Runnable() {
                    @Override
                    public void run() {
                        SwingWorkerPropertyChangeSupport.this.firePropertyChange(evt);
                    }
                });
            }
        }
    }
}
